Obviously the flame is for the forth-coming "rock on" support so people can hold up their iphones are concerts where in the 20th century people reportedly held up devices known as lighters (that were use to consume a now-largely-banned product known as cigarettes).

As to the trademarking a blank circle, hmm.

Both the fire one and the concentric circle ones are very similar to emergency icons that denote fire and earthquake respectively. Not that this makes any sense, just sayin. :)

These aren't application icons. They very clearly match the sub-icons in applications like the iPod function. For instance, "Artists" and "Podcasts".

I don't think the road icon is necessarily for navigation or turn-by-turn. I would expect Apple's sense of creativity to prompt an icon with an actual turning road. So I would guess this icon is more for something related to "on-the-go". And I doubt the concentric circles are for targeting - they already have a targeting icon (in the Google Maps app).

Since the icons are being registered at the same time, we might consider the possibility of them all belonging to one app? Maybe an Emergency Alert app is right Gazoobee - highway, fire, earthquake and region (or tornado) alerts. Even though those are very California/West things which is Apple's immediate neighborhood, would they dedicate an app for it?

The flame icon is obviously a new app to show where all the local fires are at any one point in time. Or perhaps the latest urban unrest.

The target icon is also obvious. Used in the new "iHit" app, you use this icon to select the person you want wasted. Using the new payment mechanisms in the app store, you'll be able to offer up the price of your hit, various people will bid, and then your target gets iced. No muss, no fuss (sorry, folks, you have to find me before you can use it on me).

Maybe the empty circle is an icon that will hold a changing character or numeral?

The emergency app hypothesis seems reasonable. The empty circle would indicate either a solar eclipse (like those fat slobs in Wall-E some people might need to be told that it just got dark outside) or perhaps the death of our sun.

Clearly the concentric cirlces is related to hyponosis. Alerting the user to presence of a RDF maybe?

These icons are nothing new - they're all from Nike iPod. Sounds like you guys need to get out and do some exercise :)

Those are just the icons from Nike iPod application from iPod touch second generation... http://bit.ly/imAeJ